Grout Waterproof

Grout WaterproofGrout is often used in moist areas of the home. This may make one wonder, is grout waterproof? The answer is, no, grout is not waterproof. However, it is water resistant. That means it will need to be submerged in water for a very long time before the liquid starts seeping through its material.


Read on to find out more about grout’s characteristics in relation to water.

Why is Grout Used in Damp Areas?

 Another question on your mind may be, why use grout in the bathroom and kitchen if it’s not waterproof?

Even though grout isn’t waterproof, it has a solid, rigid structure that will hold up to water. In fact, if the grout is mixed correctly, it can be exposed to water for decades without showing signs of damage.

The material’s solid structure means that water will seep through at such a slow rate that it will take years before it gets all the way through to the other side to cause any significant damage.


Grout is Porous

Most types of grouts are made of Portland cement as well as various sized particles, a water-retentive additive, and some colored pigment.  This makes it porous so it can absorb water.

The material’s water-resistant characteristics make it prone to mold. However, it holds up well to water which is way it is often used in bathrooms and kitchens.

Other types of grouts are made from epoxy, a latex modified material, or a chemical resistant Furan resin. These are less porous and are often used in swimming pools. They are highly water-resistant and more flexible than their cement counterparts so they can handle water’s weight.


When Does Grout Become Less Water Resistant?

Grout typically holds up well to water. In addition to being a water-resistant material, it is also thickly applied between tiles so only the surface is exposed to water. It will take a long time for the water to seep through to the bottom layers.

However, there are some cases when grout will be less water resistant. For instance, older grout isn’t as water resistant as newer grout. This is because the water has already worn away at its outer surfaces so it can more easily work its way through to the bottom. 

Grout will also be less water resistant if it is improperly mixed or applied or if it isn’t a high-quality product.

Grout that’s subpar, or mixed incorrectly, or incompletely won’t last as long as a high quality, well-mixed grout. It must also be applied according to directions to ensure water won’t get through.  

A good application also means a smoother surface. If the grout is applied so it has a rough surface, it will make it easier for water to get through. It will also cause pieces to break off when it’s cleaned making it even more prone to water damage.


If you are looking for quality grout that’s well applied and will stand up to the test of time, call Grout Experts. Our years of experience in the industry ensure you get a great application every time. Contact us for all your grouting needs.

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